With the ability to calculate (quantify) Sudoku's difficulty, to identify if there are multiple solutions, and to determine if there is a solution, 'for people making sudoku' Useful tools ".
This Sudoku introduced by “Sudoku Gen” on Twitter was “There are multiple solutions” in “Sudoku Checker”.
https://twitter.com/sudokugen_bot/status/1186076373288247301
* “Sudoku Checker” is a free app that checks your Sudoku. You can check the following:
-Is there only one solution?
-How difficult is it?
https://apps.apple.com/jp/app/id1458321132
Download from App Store
The contents of the self-made Sudoku® questions may be "worried correctly?"
At that time, a verification tool was created.
As the "degree of difficulty" is calculated in parallel in the judgment logic at the time of verification,
In order to confirm the validity of the number, I am using "hard sudoku" found on the Internet.
When I examined the question of “@15npken's ★ super advanced (master)”, I got the following result:
Difficulty: 540
( https://twitter.com/15npken/status/1141658523111059456 )
This is a difficult question.
"Sudoku Checker" is a free app that can be used on the iPhone / iPad.
https://apps.apple.com/jp/app/id1458321132
Please download it from the App Store and use it.
“Sudoku Checker”, an R2o convenient tool, is an application for checking whether or not a self-made Sudoku® puzzle can be solved.
At the time of verification, the "degree of difficulty" is calculated by a unique calculation method.
As a result of examining the question introduced by "@nsoga0416" 's Twitter "It seems to be the world's hardest sudoku", the "degree of difficulty" was 509.
(Sorry to use it without permission)
It is quite a difficult task.
( https://twitter.com/nsoga0416/status/1141261307628285952 )
"Sudoku Checker" is a free app that works on iPhone / iPad.
https://apps.apple.com//app/id1458321132
Download it from the App Store and use it.
We introduce actual question verification information in "Sudoku Checker" which is a convenient tool for verifying whether "Shudoku" made by yourself is "unsolvable".
The results of verifying @15npken's Twitter questions were:
-Degree of difficulty: 699
( https://twitter.com/15npken/status/1141301760780193794 )
The calculation method of the difficulty of "Sudoku Checker" of R2o type convenient tool is as follows:
- Cells found simply: +1
- Need a little twist: +10
- Need hypotheses to test: + α
"Sudoku Checker" is a free iPhone / iPad app.
https://apps.apple.com/app/id1458321132
Please download from the App Store, and install.
"Sudoku Checker" of R2o Tools can check "Is it a question that you can solve your own sudoku puzzle?"
At that time, the tool calculates the "degree of difficulty" by the calculation method of its own.
When examining the question of "the world's hardest sudoku" found by network search, the "degree of difficulty" was 735.
https://www.kristanix.com/sudokuepic/worlds-hardest-sudoku.php
(See photo)
It was quite a difficult task.
As expected, it is the world's hardest.
"Sudoku Checker" is a free app that works on iPhone / iPad.
Download it from App Store and use it.
We introduce the verification case of the actual question by "Sudoku Checker".
Sudoku Cheker is a handy tool to verify if a question is a "solvable question" or not when you create a Sudoku.
When verifying the question of 2019/6/15 of @15npken's Twitter
The "degree of difficulty" was 261.
(Thank you for verifying it)
According to the Twitter, the question was "You can solve it without using the hypothesis method." However, the R2o-style handy tool "Sudoku Checker" used to be the number of difficulty levels using the hypothesis method. I am keenly aware that there is still room for improvement.
Sudoku Checker is a free smartphone app.
Download from the App Store and install.
"Sudoku Checker", an R2o convenient tool, is a tool to check whether a self-made Sudoku® puzzle can be solved.
The tool calculates the "degree of difficulty" in a unique way during verification.
As a result of examining the question of "World's hardest sudoku the world's hardest sudoku" searched on the network, the "degree of difficulty" was 734.
It was quite a difficult task.
There is something about the world's hardest.
"Sudoku Checker" is a free app that works on iPhone / iPad.
Download from the App and use it.
When you make your own sudoku, the tool to verify its correctness will display the "degree of difficulty of the question".
This calculation method was originally devised.
For example, when it is blank like a photo
The degree of difficulty is as follows.
- "The four cells on the right side of the upper row" are blank
- "The upper three cells in the right column" are blank
- "One of nine places on the upper right" is blank
When the above mentioned ...
- The number of difficulty: 16 will be.
There are six cells (+6) that can be easily judged from other numbers, and one place (+10) where a little ingenious judgment is required: "6 + 10 = 16"
This "Sudoku Checker" can be installed on iPhone / iPad for free.
Download from the App Store 
There is a logic puzzle called Sudoku®.
You can find many Sudoku® questions on the Internet.
As you get used to this logic puzzle, you will want to find and challenge difficult questions.
"Sudoku Checker", which is one of R2o convenient tools, can check Sudoku ® questions.
For example)
・Is there only one solution?
・If there are multiple solutions, which number can fit in which cell?
・Is there no solution?
・etc.
can be verified.
One day, I found Sudoku's question with "Very Hard".
(Please see the photo for the URL of the question)
The question was verified by "Sudoku Checker",
It was judged that this was a question with multiple solutions.
(As in the photo, the yellow squares in the middle are valid for 1 or 5)
It is certainly "Very Hard" to answer the question which is not one solution.
This handy tool is a free app that you install and use on your iPhone or iPad.
Download it from the App Store Download it from the App Store and use it.
Useful for people who create their own logic puzzle Sudoku
"Sudoku Checker"
Has been upgraded.
Version 1.1 implements the following improvements:
...The installation target iOS has been expanded to "iOS9".
...The entered numbers are displayed in bold and large. The numbers to be guessed are thin and small. It is easy to distinguish.
...When it detects that there are multiple solutions, it is easy to see which number can be in which place.
The "Sudoku Checker" is now easier to use.
You can Download it from App Store .
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